Automatic voltage controller



P 6, 1932- w. c':. HEALD 1,875,868

Av'rommc VOLTAGE CONTROLLER Filed Sept. 25. 1929 Inventor WWI/18m C1%370] A iiomey Patented Sept. 6, 1932 WILLIAM c. HEALD, or IBELLOWS FALS, VERMONT AUTOMATIC VOLTAGE c mmuna- I Application flled september25.1929. "serial rm. 395,099.

This invention appertains to new and useful improvements in transformercontrollers for electricity distribution systems.

The primary object of this invention is to provide automatic meanswhereby a current distributing line may be built up upon a decrease inits voltage.

During the course of the following specification and claims, numerousimportant objects and advantages of the invention will readily becomeapparent to the reader.

In the drawing:

The single view represents a diagram of the novel automatic voltagecontroller.

Referring to the drawing, wherein like numerals designate like parts, itwill be observed that a pair of relays are denoted generally by A and B.

Numerals 5 and 6 designate the two sides of a current distributing line,while numeral 7 represents generally a transformer of the typeespecially adapted for use in conjunction with this invention.

Each of the relays includes a core 8 With a coil 9 wound thereon, thecore being mov pivotal beam 10 able and connected to a through theagency of a pivotal link 11. As is clearly shown in the drawing, eachbeam is pivotally supported as at 12 and has an extension 13 carryingthe means 14. This means 14-may include a spring (not shown) fornormally maintaining the beam in an upward positionat its free end. I

A dashpot 15 is provided adjacent the free end of the respective beam toretard the action thereof. Each beam is also equipped with a block 16 atits free end for bridging either the contacts 17 and 18' or the contacts19 and 18 as the case may be. r

The transformer 7 includes a core 20, a primary winding 21 and asecondary winding 22 which has an intermediate tap from which the lead23 extends. One side of the secondary winding is connected by means ofthe conductor 24 to the contact 18 of the relay B, while the oppositeside of the sec.- ondary Winding is connected by way of the wire 25 tothe contact 18 of the relay A. The tap wire 23 is connected to thecontact 17 of the relay B, while the contact 18' of the relay B isconnected by way of the Wire 26 to the line 6 of the distribution line.The contact '19 of the relay'B is also connected to the negative line 6of the line.

The contact 17 of the relay A is con- 65 nected by way of the wire 27 tothe line 5 of the distribution line while one side of the transformerprimary winding 21 is likewise connected through the agency of theconductor 28 to line 5. 4 The opposite line of the primary winding isconnectedby way of the conductor 29 to theline 6 ofthe dis- 2 tributionline. It will also be noted that the contact 18 of the relay A isconnected by thejumper 30 to the line 5 of the line, as is the contact19.

' The system is normal, when lines 5 and 6, and both relays A and B havetheir blocks 16 engaged with contacts 17 "and18. Block- -16 of relay Abridges contacts 17' and 18'- and completes the line 5"and it can beseen that contacts 18 and 19 0f relay A open the circuit of the lead 25and relayB being in the position as above described, leaves contacts 18and 19 unbridged, thus leaving the circuit of wire 24 from'the otherside of the secondary winding to the line 6 open.

Although the primary is across the lines 5 and 6, no transforming actioncanbe completedby the secondary. When the potential falls across lines 5and 6," relay A does not have suliicient magneticv pull to retain itsposition and is pulled by gravityto bridge contacts 18 and 19, whilerelay B retains its former position. This operation of relay A breaksthe circuit of line 5 and closes the secondary lead 25. It is obviouslyshown that the voltage isstepped up by the use'of a portion of thesecondary'winding establishing a circuit from line 5 to contact 19, tocontact 18 of relay A, from there through wire 23 to=contact 17 and fromthere to contact 18 of relay B and then to theline 6.

As the potential decreases further, relay B becomes insufiicientlyenergized and block 16 is pulled by gravitationtocontacts 18 and19 whichopensthecircuit of wire 23'and closes it to the full secondary winding22 which extends from the line 5 through contacts 18 and 19 of relayAthrough winding 22 and wire y es 24 and through contacts 18 and 19 ofrelay B to the line 6.

Manifestly, the foregoing invention provides means for alwaysmaintaining a voltage Within certain limitations and this is through theagency of automatic means.

Having thus described the invention, What is claimed as new is:

1. An automatic voltage regulator for distribution lines comprising atransformer having a primary and a secondary Winding, an opening in oneof the distribution lines, the primary Winding of said transformer beingconnected across the distribution lines on the supply side of theopening, electromagnetic means for closing said lines at a predeterminedvoltage and upon a decrease in voltage to open said line and connect oneside of the secondary winding to one of the distribution lines, and asecond electro-magnetic means adapted upon the decrease in line voltageto connect a tap of the secondary Winding to the other distribution lineand upon a further decrease in voltage to connect the other terminal ofthe secondary winding to the other distribution line.

2. An automatic voltage regulator for electrical distribution lines,comprising a transformer having a primary and a secondary Winding, oneof said distribution lines having an opening therein the primary windingof the transformer being connected across said distribution lines, onthe supply side of the opening in the line, a relay having a windingconnected across said distribution lines on the supply side of theopening, a. second relay connected across the distribution line on thesupply side of the opening, a circuit maker and breaker controlled bythe first named relay for normally closing the line at a predeterminedvoltage and adapted upon a decrease in voltage to open said line, asecond circuit maker and breaker controlled by said relay and connectedin series with one terminal of the secondary Winding and to one of thedistribution lines and'adapted upon the decrease in voltage to close andconnectthe said secondary Winding terminal to the distribution line, acircuit maker and breaker controlled by the second named relay andconnected in series with a tap of the secondary Winding and the outerdistribution line and adapted upon the decrease in voltage to connectthe tap to the distribution line and a second circuit maker and breakercontrolled by the second relay and connected in series with the otherterminal of the secondary Winding and the other distribution line andadapted upon a further decrease in voltage to connect the terminal ofthe secondary Winding to the other distribution line.

In testimony whereof I aflix my signature.

WILLIAM C. HEALD.

